Library of Congress - Official site of the national library of the US. Basic and advanced catalog search including books, periodicals, photographs, images, and sound recordings. Sections for librarians, archivists and researchers.
Consists of primary source and archival materials relating to American culture and history, more than 7 million digital items from more than 100 historical collections.
Provides innovative and effective bibliographic control of the Library's collections and leadership to the library and information communities in the development of cataloging theory and practice.
A continuing series of books prepared by the Federal Research Division sponsored by the Department of the Army. This online series presently contains studies of 100 countries.